Transparent checkerboard for ImageViewer is now dark.
Update README.md
Merge pull request #8774 from Denisov21/patch-16

Update README.md
Merge pull request #8772 from adobe/larz/issue-8771

Transparent checkerboard for ImageViewer is now dark.
Updated by ALF automation.
Merge pull request #8799 from adobe/alf_localization

ALF Automation
Merge branch 'master' into couzteau/hsv-theme